Grinding device



C. SHLAGEL.

GRINDING DEVICE.

HPLICATION FILED Aue.13, I921.

Patented'Sept. 5, 1922..

2 SHEETS-SHEET I.

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GRINDING DEVICE- APPLICATION FILED-AUG. I3. 1921.

PatentedSept. 5; 1922.

2 SHEETS-SHEET 2.

INVENTUR om E5 5HLA6EL B A TTOHNEYS Patented Eiept. 5i, ld ilio CHARLES SHLAGEL, OE CLARA CITY, MINNESOTA.

GRINDING DEVICE.

Application filed August 13, 1921. -Seria1 No. 492,049.

To aZZ whom it may concern:

Be it known that I, CHAnLns SHLAGEL, a citizen of the United States, and a resident of Clara City, in the county of Chippewa and State of Minnesota, have invented a new and Improved Grinding Device, of which the following is a full, clear, and exact description.

The invention relates to devices for grinding engine cylinders and other similar work, and its object is to provide a new and improved grinding device arranged for convenient attachment to a lathe and more spe cially designed for grinding the interior surface of a worn-out cylinder of an. internal combustion engine to make such cylinder again true and smooth for the'proper working of the piston.

Another object is to permit of grinding a cylinder accurately and in a comparatively short time.

Another object is to provide a grinding device which is simple and durable in con struction, very effective in operation, and not liable to get easily out of order.

lVith these and other objects in view the invention consists of certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the improved grinding device in position on a lathe for grinding a worn-out or untrue cylinder of an internal combustion engine.

Figure 2 is a transverse section of the same on the line 22 of Figure 1. a

Figure 3 is an enlarged longitudinal. central section of the grinding wheel, its arbor, and the mounting therefor.

Figure 4 is a cross-section of the same on the line 4:& of Figure 3.

Figure 5 is a similar view of the same with the parts in a different position, and

Figure 6 is an elevation of the work holder.

The improved grinding device is shown attached to a lathe of usual construct-ion having a bed 10 on which is mounted to travel a carriage ll fed forward or backward by the usual feed screw 12. 011 the tail end of the bed 10 is mounted a workholder 15 provided with a vertically disposed guideway 16 fixed to the bed 10 and on the said guideway 16 ismounted to slide up and down a'slide 17 supporting a sidewise adjustable sliding plate or holder 18, on which is removably fastened the work 19 by the use of bolts 20 or other fastening means. As

shown in Figure 1, the work 19 is in the form of a four cylinder block, of which the uppermost cylinder is to be ground at the time. In order to'impart a transverse sliding movement to the sliding plate 18, use is made of a-transversely extending'screw rod 21 journaled in the slide 17 andscrewing in a nut 22 attached to or forming part of the sliding plate 18. The forward end 23 of the screw rod 21 is made polygonal for the application of a'handle 24 to allow the attendant of the machine to conveniently turn the screw rod 21xwith a view to move the sliding plate transversely on the slide 17. In order to move the sliding plate and with it the slide 17 up or down, use is made of a vertically disposed screw rod 25 screwing in a nut 26 attachedto or forming part of the guideway 16. On the upper end of the screw rod 25 is secured a bevelled gear wheel 27 in mesh withthe'b'evelled gear wheel 28 attached tothe rear end of a transversely extending shaft 29 mounted to turn in the slide 17. The outer polygonal end 30 of the shaft 29is adapted to receive the handle 24: to permit the attendant to'turn the shaft 29 with a view to raiseor lower the sliding plate 18. By the arrangement described the work 19 can bereadily adjusted to move the cylinderto-be ground into accurate position for grinding as hereinafter more fully explained.

In order to grind the interior surface of the cylinder, use ismade of a grinding wheel 40 secured on'the right hand end of a longitudinally extending arbor 41 journaled in suitable bearings 42 arranged within an arbor supporting tube 13 extending divergently througha hollow shaft 44: mounted to turn in suitable bearings arranged in standards45fattached to the top of the carriage 11.' The-left hand end of the arbor 41 is provided with a pulley 50 connected by a belt 51with a pulley 52 secured on a sleeve 53 journaled in suitable bearings 54 arranged on the upper "ends of the standards 45. Through the sleeve 53 extends a driving shaft connected by key and lreyway 56, 57, with the sleeve 53 to rotate the latter and to allow the sleeve to slide lengthwise on the driving shaft 55. The driving shaft 55 is journaled in bearings attached to the head stock 61 of the lathe and the said driving shaft 55 is provided with a pulley 62 connected by a belt 63 with one of the cones of the cone pulley 6 1 mounted on the lathe. The cone pulley 64: is connected by a belt 65 with other machinery for imparting a rotary motion to the cone pulley 645, which by the'belt 63andthe pulley 62 rotates the driving shaft 55. The rotary motion of the driving shaft 55 istransmitted by the sleeve 53, pulleys 52,. 50, and the belt 51 to the arbor l1 to rotate the latter and its grinding wheel 40. It. will be noticed that on moving the carriage 11 forward or backward, the sleeve 53 slides on the driving shaft 55 without disconnecting one from the other, and hence, the sleeve 53 is rotated whenever the driving shaft 55 is rotated.

In order to impart. a planetary movement to the grinding wheel 40 for the latter to grind the inner surface of the'engine cylinder, the following arrangei'nent is made On thehollowshaft i t is secured a bevelled gear wheel in mesh with a bevelled pinion 71 secured onthe lowerend of a shaft 72 journaled. in a bearing 73 attached to or forming part of one of the standards On the upper end of the shaft 72 issecured a worm wheel 75 inmesh with a worm 75 tube 43. The worm wheelSd is in mesh with.

a worm secured or formed on worm shaft 86 journaled in suitable bearings 87 attached to or forming part of the collar 82. A handle or other. suitable tool is applied to the outer polygonal endSS-of the worm shaft 86 to permit theattendant of the machine to rotate the worm wheel 84 with a view to vary the angularity of'the axis of the arbor 41 with that of the hollow shaft 44:, itbeing understood that the axisof thehollow shaft 14 coincides with the axis of the cylinder to be ground by. the wheel d0. It is understood that thecollar 8lformsa pivotal connection between the left;hand.end of the arbor supporting tube. 43 with the hollow shaft 44:,

and the. worm wheel. 84 1 on account; of'beingeccentricaily: attached-to. the; tube 43 andbeing -eccentrically mounted in the; collar 82.

provides the desired divergence of the axis of the arbor 41 relative to that of the hollow shaft The operation is as follows :lVhen the several parts are in the position, as shown in Figure 1, and the lathe is running, then the carriage 11 is fed from the left to the right by the feed screw 12 to move the grinding wheel 40 into the iu'iperniost cylinder of the work 19 held on the sliding plate 18. A continuous rotary motion is given to the arbor il and its grinding wheel 40, as pre viously explained, and bodily planetary motion is given to the grinding wheel i0, as above set forth, to cause the peripheral face of the grinding wheel i0 to move circularly. in contact with the inner surface of the cylinder to be ground. As the axis of the rotating, hollow shaft 4% coincides with the axis of the cylinder, it evident that. the inner surface of the cylinder is ccurately ground by the grinding wheel 40 and the latter is bodily advanced by the movement of the carriage 11 to grind the cylinder throughout its depth. By adjusting theangular movement of the arbor a l relative to the hollow shaft as on turning the worm shaft 86. as previously explained, the desired amount of throw is given to the grinding wheel ft) to cause the latter to make a cut to the required depth. The grinding device shown and described can be readily attached to a lathe of usual construction. It will also benoticed that a worn-out or untrue cylinder can be accurately ground by the use of the grinding device to render such cylinder true and smooth for proper working of the piston.

Having thus described my invention, what I claim as new and desire tosecure by'Letters Patent is:

1. A grinding attachment for lathes comprising a support arranged for attachment to a lathe carriage, a work holder arranged for attachment to the tailend of a lathe'and adapted to support a cylinder. to be ground, an arbor carrying a grinding wheel adapted to grind the interior surface of the cylinder, an arbor supportii'ig tube in which the arbor is journaled, a hollow shaft journaled in the said support and within which the said arbor supporting tube is divcrgently mounted, a driving shaft adapted to be driven from the lathe arbor, a sleeve mountedito slideon and to turn with the said driving shaft,.the said sleeve being journaled in the said support, fast speed driving means connecting the saidsleeve with the said arbor to rotate the latter at a high speed, and slow speed driving means connecting the said sleeve with. the said hollow shaft to rotate the latter at a. slow. speed.

2. A. grinding attachment. for lathes comprising a-support arranged for attachment. to. a lathe-carriage,a work holder arranged for: attachment to the tail end of azlathe-and;

adapted to support a cylinder to be ground, an arbor carrying a grinding wheel adapted to grind the interior surface of the cylinder, an arbor supporting tube in which the arbor is journaled, a hollow shaft journaled in the said support and within which the said arbor supporting tube is divergently mounted,

driving means for rotating the said arbor, driving means for rotating the said hollow shaft, a worm shaft having a worm and journaled transversely in one end of the said hollow shaft, a worm wheel secured eccentrically on the said arbor supporting tube and in mesh with the said worm, the said worm wheel being eccentrically mounted on the said hollow shaft, and a pivotal connection between the other end of the said hollow shaft and the said arbor supporting tube.

3. In a grinding device, a driven arbor carrying a grinding wheel. at one end, a tube in which the arbor is journaled, a driven hollow shaft through which extends the said tube, the latter bein mounted to swing at one end on one end of the said llOllOW shaft, an eccentric held eccentrically on the other end of the said shaft and eccentrically supporting the said tube, and manually controlled means mounted on the said shaft and engaging the said eccentric to turn the latter to vary the angularity of the said tube and arbor relative to the shaft.

4e. In a grinding attachment for lathes, comprising a support adapted to be at tached to a lathe carriage, a hollow shaft mounted in the support and provided with a collar at one end, an arbor supporting tube in the hollow shaft and provided with a collar having a conical face with which one end of the hollow shaft engages, a worm wheel having an eccentric hub extending into the one end,,means for rotating the arbor, and

meansfor rotating the hollow shaft.

5. In a grinding attachment for lathes, comprising a support adapted to be secured to the lathe carriage, a hollow shaft mounted in the support, a tube pivoted at one end in the hollow shaft, an eccentric on the tube and upon which oneend of the hollow shaft turns, an arbor mounted in the tube and carrying a grinding wheel at one end, a sleeve mounted in the support, a driven shaft extending through the sleeve and upon which the sleeve slides but turns therewith, gearing between the sleeve and the arbor, and gearing between said sleeve and the hollow shaft.

6. In a grinding attachment for lathes, comprising a support adapted to be secured to the lathe carriage, a hollow shaft mounted in the support, a tube pivoted at one end in the hollow shaft, an eccentric on the tube and upon which one end of the hollow shaft turns, an arbor mounted in the tube with its ends projecting beyond the ends of the tube, a grinding wheel on one end of the arbor, a pulley on the other end of the arbor, a driven shaft, a sleeve mounted to slide on the shaft and to turn therewith, a pulley on the sleeve, a belt connecting the pulley with the pulley of the arbor, a bevel gear wheel on the hollow shaft, a shaft having at one end a bevel pinion meshing with the bevel gear wheel and a worm wheel at its other end, and a worm on the sleeve meshing with said worm wheel.

CHARLES SHLAGEL. 

